WASHINGTON - Hollywood actor Charlie Sheen has urged President Barack Obama to reopen the investigation into the September 11, 2001 terror attacks. In a letter, the star requested a meeting with the president while reminding him of his promises of change, accountability and government transparency by using his powers to look into the actions of George W Bushs previous administration. He has been insisting that there was a cover-up surrounding 9/11. Sheen highlighted several issues in the video, including the collapse of World Trade Centre 7 in Manhattan. He also cited multiple reports from firefighters, police, first responders and others who were at Ground Zero and who all described explosions before the collapse of the Twin Towers and Building 7. We have questions Mr President, lots of questions. ... People of the United States and the world demand the truth, sir, Sheen said, adding that Obama has the power and the responsibility to initiate a truly independent Congressional investigation into the events of 9/11 as well as its aftermath.